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Re:Ask HN: Personal photo library recommendations? Open sour... by naikas on Monday April 29, 2019 @08:27AM (#19777661)
I am looking for this exact feature. Identifying duplicates from multiple back-ups. Is there a cool way?
Re:Ask HN: Personal photo library recommendations? Open sour... by JustSomeNobody on Monday April 29, 2019 @09:56AM (#19778365)
Exiftool allows you to handle dupes while organizing photos.

http://owl.phy.queensu.ca/~phil/exiftool/